رهيافت جديد براي اصلاح روش حفاظت خطاي نابرابر (UEP) در ارسال ويدئو روي شبکههاي بيسيم
الموضوعات :حسین قانعی یخدان 1 , مرتضی خادمی 2 , جلیل چيتيزاده 3
1 - دانشگاه یزد
2 - دانشگاه فردوسی مشهد
3 - دانشگاه فردوسی مشهد
الکلمات المفتاحية: شبکههاي بيسيمويدئوي 4-MPEGبهبود خطاUEP,
ملخص المقالة :
کارآيي ارسال ويدئوي فشردهشده روي شبکههاي بيسيم توسط نويز کانال محدود شده و کيفيت ويدئوي دريافتي بهشدت ضعيف ميگردد. از اين رو چندين ابزار بهبودپذيري خطا به استاندارد فشردهساز ويدئوي 4-MPEG اضافه شده است. علاوه بر اين ابزارها، شيوه حفاظت خطاي نابرابر (UEP) بهمنظور حفاظت بيشتر بخشهاي مختلف در بسته ويدئوي 4-MPEG با نرخهاي کدگذاري متفاوت بر پايه کدهاي RCPC پيشنهاد شده است. با اين حال، تلاشهاي صورتگرفته تاکنون براي شبکههاي بيسيم هنوز براي داشتن کيفيت مطلوب، کافي نميباشد. در اين مقاله، براي مقاومکردن هرچه بيشتر ارسال ويدئوي 4-MPEG روي شبکههاي بيسيم، رهيافت حفاظت خطاي نابرابر اصلاحشده (MUEP) بر پايه محتواي صحنه ويدئو پيشنهاد ميگردد. در روش پيشنهادي، نرخ خروجي کدکننده کانال براي بخش حرکت بسته ويدئوي 4-MPEG بر اساس محتواي حرکت داخل صحنه ويدئو تعيين ميشود. نتايج تجربی نشان میدهد که در روش پیشنهادی علاوه بر افزایش میانگین PSNR تا مقدار dB 5/1 نسبت به روش UEP سنتی، کیفیت ذهنی ویدئوی دریافتی نیز ارتقا مییابد.
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